War with Mexico
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The Mexican-American War (1846–1848) was the result of the United States' annexation of Texas in 1845 and a border dispute over whether the Texas boundary ended at the Rio Grande River. The war—in which U.S. forces were consistently victorious—resulted in the United States' acquisition of more than 500,000 square miles of Mexican territory extending westward from the Rio Grande to the Pacific Ocean. The Treaty of Guadalupe Hidalgo ended the war. See "Ceded by Mexico" under "Territories". The Mexicans suffered twice the number of casualties as the Americans did as the result of the war. The treaty forced Mexico to sell the territory for 15million dollars to the United States.